Actually, since the counteroffensive began in Paraguay, Australasia has not interfered much with the actions of the Paraguayan army.
The group of officers originally sent had also transformed into a military observation group, learning a thing or two by simply observing the war between the two countries.
On the Australasian side, they were constantly estimating the war potential of Bolivia and Paraguay.
This so-called war potential is essentially the amount of manpower, material, and financial resources the two countries can still expend.
In fact, not only Australasia but also Britain and France were likely making estimates to determine when to bring an end to the war.
Reality is that cruel. Both Britain and Australasia had the power to end the war and could have significantly reduced Paraguay's casualties.
But the issue is, such action had no benefits for Britain and Australasia, which is why neither country stepped forward to mediate the conflict.